Metrology & Quality Engineering - May 2016

Mechanical Engineering (Semester 6)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1(a) Explain principles of interference(5 marks) 1(b) Explain objectives of quality control(5 marks) 1(c) Differentiate between roughness and waviness.(5 marks) 1(d) Differentiate between precision and accuracy(5 marks) 2(a) Explain different types of fits. Also Explain Taylor's principle of gauge design.(10 marks) 2(b) Explain following terms with respect to gear measurement:-
i) Measurement using rollers
ii) Gear tooth Comparator(10 marks) 3(a) With the help of suitable diagram explain construction and working of Laser Interferometer.(10 marks) 3(b) Explain different type of quality costs.(10 marks) 4(a) With reference to surface roughness parameters explain following terms-
i) R_a
ii) R_y
iii) R_z
iv) RMS value(10 marks) 4(b) DO you agree with following statement? If yes why? If not why? Justify your views
'If all points in X and R chart lies within UCL (Upper Control Limit) and LCL (Lower Control Limit) , all parts should be accepted'(10 marks) 5(a) Explain three wire method in screw thread measurement(10 marks) 5(b) Explain in brief modern SQC tools(10 marks) 6(a) Sketch typical OC curve and also explain following terms-
i) Acceptable Quality Level (AQL)
ii) Producer's Risk
iii) Consumer's Risk(10 marks) 6(b) Explain principle of working, construction and applications of Profile Projector(10 marks)